Amp making car elec. flicker

The more items you have on in your car the harder it is on the electrical system, if you are running a defroster/heater it will draw more current and make it seem worse then in slightly warmer weather.  I'm suprised no one has mentioned using a cap, maybe I don't understand you situation fully.  If you lights are flickering slightly when the bass hits then a cap might be an easy solution, however if it is a constant problem I would look to the alternator.  Also make sure you are using a large enough guage wire to power your amplifier.  What size wire are you using and what size amplifier do you have. 

Yeah, if you mean the headlights dim when the bass hits, I'd add a cap, as Kenmci said.  You were pretty vague in your post, so I didn't understand what you were asking- "car's electrical flickers".My ex once told me I have a perfect face for radio.